Amazon.com has the Alfa AWUS036H Upgraded to 1000mW 1W 802.11b/g High Gain USB Wireless Long-Rang WiFi network Adapter with 5dBi Antenna - for Wardriving & Range Extension for a good price.
Item has a rating of 4.5/5.0 from 302 reviews
Google Products Price : $24.24 ~ $54.37 Shipped
1. Amazon Price : $27.99 Shipped
2. Use coupon code 8OFFPROM to get $10 off
Final Price : $19.99 Shipped