I've bought so much from this site, that there's not that much that I need anymore.
Here's a gift voucher I was sent in an email. It can only be used once.
Your Personalized X10.com Voucher Number Is:
under $50 $20 OFF!
$50 - $99 $22.50 OFF!
$100- $149 $40 OFF!
$150 - $199 $60 OFF!
$200 or more $80 OFF!
Also, free shipping on orders over $25
Be careful! I recently bought from X10 and they charged me 2 times AND failed to use the voucher (even though I clicked on it AND put it in the order comments). The CSR I talked to was a dick (he wouldn't give me he name even after I asked him 2 or 3 times). The manager I spoke to afterwards wasn't very helpful either. He said that they had been double-billing a lot of people because of a new database and that they were taking care of it on their end. PLUS the items took over 2 weeks to ship. I had never had problems with X10 before, but now I'm really wary of buying from them again. If you do order from them, watch that credit card statement!
Lieutenant Junior Grade
I used to order tons of stuff from x10 also using their free vouchers. I was charged full price awhile back after using a voucher and was never credited. Other than that they have been good. I have so many damn modules from them that I don't even order from them anymore even when they offer a free voucher. The other thing I hate about them is that they spam you with e-mail every single day! Hooray for mail filters.
Overall their modules are really cool, just be sure that they charge you correctly and use an e-mail account you don't care about.