Ebay is great with Paypal buyer’s protection scheme. AliExpress should be avoid for the same reason, protection scheme is a scam and do not cover you from bad sellers (they all know it’s a flaw in the system and don’t want to rectify the situation, allowing the buyer’s abuse).
Does any one have a preferred eBay seller for acrylic? I too have bought (I also do CNC machining) however the cost has jumped for shipping to almost double the price as I would like to buy a stack and not pay double for shiping…