Hopefully this works for everyone, I was wondering if Vuly deliver to my area but to find out I had to add trampoline to cart and proceed to checkout, enter details including email address. After I found out the delivery was free I simply closed the browser and didn't proceed with the order. About 24-48 hours later I got an email from Vuly with a $50 off coupon if I answered 1 survey question which was a question asking why I didn't proceed with the order. The voucher is only eligible on trampolines or play equipment and once you answer the survey and get the voucher it's valid for 48 hours only.
Hopefully this helps someone, personally I've decided to go with Jumpflex instead.
Quite a few websites I frequent offer such vouchers after you don't finalise your cart. I just wait a day or two for the incentive voucher then purchase.
Perhaps we should start a wiki of such sites.