I suspect that any non-skim tgp script is going to require something to cover development costs. It might be better to start with a "free" skimming one, and upgrade later if the project takes off.
This post reflects my mistrust of anything that claims to be free.
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Baronets (incorporating Domains for Porn) is holding down domain registration prices for this month.
They are still $7.95 - and that's without any asterisks concealing extra charges.