What I'm finding is that I can pick up unwanted figures at conventions very cheaply - I got about 100 for $10 early this year but that collectors/dealers want more like $1/figure plus postage - Calivers with postage (25% and they keep the VAT) works out at something like $2.30 per infantry figure - more than a nicely detailed 28mm.
Yep. $1US is typical retail price for older 25mm figures, with fancy new product going for $2US+, before you consider postage, let alone postage across the Atlantic (ouch). You can often find bargains at flea markets, but you have to attend a lot of conventions and shop hard. The trick is to buy what's being offered. I believe Old Glory Napoleonics are different in size and style from Minifigs. If you want to match an old school collection, you need vintage figures.