10" f/5 (approx) means the appropriate eyepieces might be:
30mm for low power and widest field--2"
20mm for low power but a darker background and friendlier exit pupil
10mm for medium power
7mm for a low-end-of-high-power view
5mm for a moderately high power you'd use often.
If you add a 2x Barlow lens, you can shave the set to 30, 20, 7, and 5mm
The barlow will yield 10mm with the 20mm, and 3.5mm with the 7mm and 2.5mm with the 5mm. That would completely fill in the set:
30..20..10..7..5..3.5..2.5mm
There are a lot of brands. Take a look:
https://www.cloudynights.com/topic/7...de/?p=10103883
Prices are US prices. You'll need to look up prices for Oz or convert.