My running list of MBE supplements:
1) Emanuel's Strategies and Tactics for the MBE - available on Amazon. Fairly cheap book. Has good tips on approaching the MBE and contains lots of practice questions.
2) Adaptibar (
http://www.adaptibar.com) - I didn't use this, but wish I had since it has received raving reviews. The only con to Adaptibar is the price.
3) Barmax MBE Questions (
https://getbarmax.com/barmax-mbe-questions/ - supposedly "comparable" to Adaptibar). At only $249, it's a good price, but Adaptibar has tracking tools to individualize your MBE study and show your progress in a method that Barmax can't. But Barmax seems to be more economical than Adaptibar. You also need an iOS device to use it.
4) OPE from the MBE site to practice the most recent test questions:
http://store.ncbex.org/all-online-practice-exams/. OPE it isn't the cheapest option, but these are real, recent MBE questions and not the souped up Barbri ones. Barbri questions are not representative of the modern MBE. I hear Barmax has all these OPEs included.
5) Critical Pass (
http://criticalpass.refr.cc/L2L68Z5 referral link contains a discount code for $$ off) - Great flashcards for the MBE! You can't apply the law to an MBE question, if you don't know the law. I used Critical Pass for my bar study along with the CMR from Barbri and their simulated questions (although the Barbri questions are very different than actual MBE questions). I also used Emanuel's S&T during my study period, but not as much as I should have since it's a great resource.