I've mentioned it before; but since the subject is up again, here goes take 2:
Key-word "Magnifier" on eBay
brings you lots of choices.
My best buys are out of Hong Kong.
I recently got two magnifiers. One is a double loupe 10x and 20x metal/glass construction. The other is a 45x plastic magnifier with 2 LEDs.
Total cost for both delivered and taking into consideration the exchange rate is C$7.30.
Several of our local club members ordered theirs with my order and it kept individual costs down.
I have also recently ordered, from same source, an Optex magnifier which connects to computer which gives 200x images. And it can be used to make jpegs and videos of the magnified objects.
It costs US$1.00 + US$24.00 shipping. I assume he low initial price makes the customs declaration low so the buyer saves big-time.
This is the same one that is on sale this week at London Drugs, in Canada, for $69.99.
Again, use key word "Magnifier" on your eBay
CAUTION, don't buy the first one you like which is listed.......go down the list and there is usually more of the same one at cheaper prices.