Do you Know someone with good reputation here in the forum selling CashU codes?
Have you tried opening a thread asking for this? Maybe some newbs will approach you but as long as you use an escrow then the risk should be smaller.
The escrow cannot verify if the codes in coupons are valid. But it may works if the vendor is a reputed member. Also this won't help me a lot because i am willing to buy many times in the future (need it to run a small business) and if i find someone who can sell me each time i want, i will have to pay the escrow which will increase the cost per coupon.
I have tried once from dundle.com.
To purchase just for once, dundle is a good option but as i said above, by calculating all the fees this won't be profitable.