You generally have to build them. R100's make great repeaters, you just have to have someone who can program them. I have two of them and my main problem is that I don't have a 486 or slower to program them with. It's also not just programming, you have to realign the receivers after you program them so you might as well align the transmitters while you're at it. Best thing to do, buy two UHF GM300's (a wideband, 10-25W model should run around $30). Find someone who can program them for you (and turn the power down to 10W if you plan on using it a lot). Purchase a GM300 repeater cable ($10 on ebay) and a UHF notch duplexer ($80-100 on ebay) that will handle the power level you're wanting to run at. All you need now are the various coax connections, power supply (or batteries) and an antenna.