This Speaker

J&R has the Polk Audio Rectangular 2-way In-Wall Loudspeaker for $79.99 with free shipping.
Product link.

Buy.com has the OEM Systems SE-791E ArchiTech Premium 6.5” In-Wall 2-way Speakers for $59.99 with free shipping.

Product description from Buy.com:

Architech SE-791E Premium Series 6.5″ In-Wall Speakers

FeaturesManufacturer OEM Systems Company, IncManufacturer Part Number SE-791EStandard Warranty Lifetime LimitedManufacturer Website Address www.oemsystems.comForm Factor In-wallOutput Power 40 W (RMS) / 80 W (PMPO)D
imensions 12.13″ Height x 8.63″ WidthDriver Type 1 x 6.50″ Long-Throw Poly Woofer
1 x 1″ Soft Dome Pivoting TweeterFrequency Response 45 Hz to 20 kHzProduct Line ArchiTechProduct Series Premium SeriesProduct Model SE-791EProduct Name ArchiTech Premium Series SE-791E SpeakerProduct Type Speaker

Product link.

Amazon.com has the Polk Audio RC80I 2-Way In-Wall Circular Loudspeakers - Pair for $128.99 with free shipping.
Product link.

J&R has the Pioneer S-IW531L 5-1/4” In-Wall Center Speaker for $199.00 with free shipping.
Product link.

ElectronicsExpo has the Polk Audio RC60i White Round 6.5” Two-way In-wall/ceiling Loudspeaker - Pair for $87.82 - $4.39 off coupon code “LSVXMA25″ (Expires 11/01/2009) + shipping = $93.42 Shipped.
Product link.

Crutchfield.com has the Boston Acoustics DSi450 5.25” 2-way In-wall Speakers for $149.99 - $20 off coupon code “3A825″ = $129.99 with free shipping.
Product link.

Meijer.com has the Infinity CS50 5-1/4” 2-Way In-Wall Speaker for $74.99 + shipping = $84.94 Shipped.

RadioShack.com has the BIC America VK-38W 8” In-Wall Speakers for $149.99 with free shipping.

Product description from RadioShack.com:

Enjoy rich, full audiophile sound for far less with the VK-38W from BIC America. These kevlar cones enable superior acoustical quality, improved mid-bass and extreme durability under high-stress conditions. Plus, they are less susceptible to blowout, even when being driven at the highest levels.

• 8″
  Kevlar cones deliver rich, full audiophile sound
• Offer incredible strength and dispersion advantages compared to traditional woofers
• Less susceptible to blowout, even when being driven at the highest levels
• Deliver low frequencies down to 30Hz
• Deliver highs beyond the audible range and smooth, accurate mid frequencies
• Come with both white cloth decor grilles and paintable metal grilles to blend with any decor

Read the owner’s manual
See technical specifications
See Features of this product

Free Ground Shipping on this product. Some exclusions apply. More details

Product link.

Newegg.com has the Polk Audio RC60i Round 6.5” 2-way In-wall/ceiling Loudspeaker Pair - White for $99.99 with free shipping.

Product description from Newegg.com:

The sound isn’t really coming from out of thin air, though your guests may think so. The frame and grill of the RC60i in-wall speakers are paintable to match virtually any d??cor. Its round design mimics the look of rec
essed lighting. The easy install cam locks make installation a four step process, cut hole, run wire, install speaker, enjoy the music. These full range speakers have a 40Hz to 20kHz frequency response so you don’t even need to find a place to hide a subwoofer. The mid/woofer is an 6.5″ mineral filled polymer cone and the tweeter is a 0.75″ metalized soft dome tweeter. The tweeter is swivel mounted in a ball-and-socket joint so you can precisely aim the sound. These speakers use durable, moisture resistant materials so they are safe to use in bathrooms, kitchens, or under the eaves. They are tuned to use the in-wall space as a virtual enclosure for fantastic bass response.

Product link.

Buy.com has the Pyle PD-IW65 6 1/2″ 2-Way 200-Watt In-Wall Speaker for $32 with free shipping. 2-way, output power 200 watt, 1/2″ pivoting polymer tweeter.
Pyle PD-IWS8 8″ In-Wall High Power Subwoofer = $31 with free shipping.

Product description from Buy.com:

Pyle PD-IW65 6 5 2 Way 200 Watt In Wall Speaker

Featu
resPower handling: 200 watts6 1/2″” woofer1/2″” pivoting polymer tweeterFrequency response: 70Hz-20kHzOverall: 8 3/4″” W x 12 1/2″” H x 2 7/8″” DCutout: 7 3/4″” W x 11 3/8″” H x 2 7/8″” D

Product link.