Cheapest Windows Phone 7

HTC HD7 [T-Mobile]

http://www.microsoft.com/windowsphone/en-us/buy/7/phones.aspx#detail=1569

Contract $99.99
Retail $499.99
New $300
Used $220
Unlocked $23

HTC Arrive [Sprint]

http://www.microsoft.com/windowsphone/en-us/buy/7/phones.aspx#detail=1684

Contract $199.99
Retail $449.99
New $329
Used $223

Samsung Focus [AT&T]

http://www.microsoft.com/windowsphone/en-us/buy/7/phones.aspx#detail=1536

Contract $49.99
Retail $349.99
New $275
Used $200
Unlocked Used $220
Unlocked New $290

LG Quantum [AT&T]

http://www.microsoft.com/windowsphone/en-us/buy/7/phones.aspx#detail=1537

Contract $49.99
Retail $399.99
New $300
Used $160
unlocked Used $220
Unlocked New $290

HTC Surround [AT&T]

http://www.microsoft.com/windowsphone/en-us/buy/7/phones.aspx#detail=1538

Contract $49.99
Retail $399.99
New $260
Used $175
unlocked $22

Dell Venue Pro [AT&T][T-Mobile]

http://www.microsoft.com/windowsphone/en-us/buy/7/phones.aspx#detail=1568

Contract $99.99
Retail $299.99
New $450
Used $310
unlocked Used $450
Unlocked New $320

HTC HD7S [AT&T]

http://www.microsoft.com/windowsphone/en-us/buy/7/phones.aspx#detail=1690

Contract $200
Retail $499.99
New $450
Used $400
Unlocked $430

HTC Trophy [Verizon]

http://www.microsoft.com/windowsphone/en-us/buy/7/phones.aspx#detail=1685

Contract $99.99
Retail $429.99
New $320
Used $280
Unlocked New $320