Cheap alternative for the loupe from Chamonix

I recently bought a second hand chamonix 45f2 that came with the carbon fiber folding viewer. The length of the viewer doesn't allow me to use my small loupe. I have read that I can use a pair of magnifying glasses but I would like to see if there is another alternative for a cheap long loupe. I can spend 30-40$ for a loupe but i'm not willing to page 170$ for one.

Thanks in advance.