Please Help Me Find A Magnifying Glass

I wear bi-focal glasses with a strong prescription. I look for errors and varieties. I use a 14x jewelers loupe doublet that cost less than $7 and also a 14x Hastings B&L jewelers loupe that cost $24. I recommend having a 10x and a 12 or 14x. If you are just looking at coins to see the whole coin use a 5x with glass lens. Avoid any with built in light.
John1

Thanks, John1. You have saved me probably hours of uninformed searching.
I, too, wear bifocals with a strong prescription. Maybe I don't understand what a jeweler's loupe is. I thought it was only the one eye thingie that you put up against your eye and squinted to hold in place. The hand held magnifiers you suggested look like just what I am looking for.
If you could, it would be great if you could explain why built in lights should be avoided. The one I am using now is very convenient. I am able to see the coin better with the light on than off, so I will want to have an additional light source somewhere. Currently, I like to sit back in my recliner, holding the THG slab in my left hand and the magnifier in my right. Although I find this an enjoyable and relaxing way to enjoy my collection, maybe I should be sitting at a table with some sort of light to examine the coin under. If I were searching for errors and die varieties, I can fully understand the need for higher magnification power and proper lighting. At this time, though, I am really just using the magnifier to appreciate the engraving and design details, particularly with very small coins like Half Dimes.
Any thoughts?

In that case use the 5x that I posted a link for. As to on board light,in your case I see no problem. When I am looking for errors/varieties a single light source works best. I sit at a table with a clamp on swing arm light. By all means,use whatever magnifier and light source that works best for you.
John1