All of the keycaps I've bought have been BOGO, so that's saved me a decent amount of money. I'm happy with their quality, and feel like they stack up to other brands in their range (GMK, Signature Plastics, etc.) well. I'm a big fan of ABS keycaps and tall molds, so MT3 is really comfortable for me.

But I'm not knocking cheaper options. Whatever floats your boat!