I'm wondering if I should save my points or spend them if the stuff gets switched out a lot!

old items remain purchaseable after the card changes, and your Loyalty Points will never expire. The reason the Loyalty Cards change at all is to introduce new items and to also incentivize, show appreciation, and reward major supporters of the site who really do fill up those cards quickly.

My guess is once a season-ish, if you're looking for or waiting for something specific?

Thank you, I'll probably go ahead and buy some things then!

None of the items have ever been retired from the shop yet, as far as I know.

We get new cards every ~3 months or so, along with new items, but they don't retire any of the existing ones. If they ever decide to, I'm sure they would give us a warning first.

Thank you, that makes me feel a lot better!

you are welcome, enjoy your new items and thank you for helping support this awesome site! I really like my flamingoes.

( and also thank to you for your confirmation )