if i can't get amazon gift cards through the bitpay wallet anymore, the only other consistent option will be bitrefill, and they charge a pretty big markup.
What prices are BitPay charging for their cards? I've never found Bitrefill prices to be that expensive. At the moment, a $500 Amazon card works out to around $503 worth of bitcoin, but with the 1% reward that they offer that comes out at $498. You can even get up to 5-6% back on some other retailers, which makes their cards work out pretty cheap indeed.