The subscription crate I decided to try for December is the Enchanted Crystal Crystal Variety Box, which is a $58 per month subscription, which the description says will include 4-8 crystal or mineral specimens and a crystal grid cloth plus extra mini crystals. There is also a $16 subscription that sends the "crystal of the month."
The crate arrived well packed with each crystal individually wrapped and labeled. The image to the right is everything that came in the box (with the labels for clarity). Starting in the upper left corner and going around clockwise:
All of the specimens arrived in good condition, and two (the fairy quartz and the Lemurian seed quartz) are somewhat rare. The selection is good with a few interesting specimens (all are on the small side; just as a point of reference, the aragonite cluster is about the size of a quarter), and the value is probably close to the price of the box if I bought each crystal retail (or a little less than that - but when you add shipping costs, it's pretty close to what I'd pay to buy them all online individually and have them shipped to me in one box).
If you don't have many crystals and you'd like to have a collection come to you without going to a crystals shop, then this box may be a good way to build up your collection with decent quality crystals curated by an expert, and I like the included grid cloths each month. I'll try the subscription for another month just to see how it differs from month to month, but for me part of the joy is going to the crystals shop and picking them out one at a time. If you don't have a nearby crystals shop, then you may really enjoy this box.