Want to buy an Eyeclops for trichome pics -- what model or what factors to consider?

I want an Eyeclops, like the title says. I'm trying not to spend too much and I'm just wondering what's the minimum model or minimum features I should shell out for? I don't know a lot about these things, can someone give me some advice? Thank you.

"Eyeclops"??? I'm not sure... but I think I had shots for that in high school.