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Free is always the best price!
This said it really depends on the availability. You can find P. regalis fairly cheap $35-50 for that size from one of the forum sellers. You can also look for some locally depending on where you live. It might be a little more $ but at the same time you’ll avoid an overnight shipping cost ending up to be as much or more than the cost of your T.
Take a couple of months (it is winter after all) and compare the price of this specific spider between vendors. Once springtime comes over you’ll have a better idea of what would be a good deal and will be able to snatch it when the occasion arises.