If I saw an auction for something that size and postage at $45, I'd assume it was next day delivery. If I paid that and they sent it regular post then I'd query it for sure, if they responded like that I'd neg them straight away.

Recently I purchased a bag from the US for $12, postage was to be worked out after the sale. I was expecting it to be around $15-$20 US. Seller sent me an invoice for $70. I just said I wasn't paying that much so we cancelled the sale. However if it was a G1 MISB item, I be happy to pay that just to get it to me!

Based on this sellers auction listings and suspicious auctions when the same items were listed at $1.00 I just wouldn't buy from them.