Tenda's Nova Whole Home Mesh WiFi System is the least expensive three-node Wi-Fi System you can buy. And it works.
TP-LINK's TL-R600VPN is a pretty inexpensive way to get IPsec VPN.
Updated - TP-LINK's TL-WPA4220KIT is a wireless extender with a powerline twist.
The strongest feature of TP-LINK's TL-WA890EA N600 Universal Dual Band WiFi Entertainment Adapter is its four-port 10/100 switch.
In our matchup of two N600 class wireless bridges, neither comes out a clear winner.