The best thing to do with the jumbo ptn pins is get on ebay the moment they're released. I got Jessica jumbo for $95 ($6.90 deliery, although I'm in the UK so to US would be dearer) the night it was released. The dearest one I've found by far is the Phantom Manor one, but even that 'only' cost me around $120. The Jiminy jumbo I got on here for a lot less than the $200 someone has it listed for on ebay. I think it was around 50 euros I paid for that. The ealier you get them, the better the price. Although I overpaid for the Stitch blue lagoon ($83, whereas the same seller still has them now and has reduced to $71, or had the last time I looked!)
I've got all the jumbos so far. It is do-able. you'll be hard pressed to find someone who'll get them for you though at cost price. I've been looking for ages.