I'm currently looking for a coupler/repeater and started looking on the web.
I found Buy.com has a bunch of the Insteon and some SignaLinc devices
and most of them have free shipping and no tax.
The coupler/repeater I'm looking at is 89.99 at Smarthome plus
shipping.. I think around $5.
Buy.com has the same for $57.99 (although the 3 wire is out of stock,
the 4 wire is the same price and for comparison has free shipping)
I know some people cringe at using Buy.com, but I've had nothing but
good luck with them.
And no, I don't get any benefit from people buying from them :-)
Just passing along some info I found helpful.