SportsDirect have some pretty good prices on 100% merino wool Lee Cooper Jumpers and LS Polos:
Price varies ($18-30) depending on style & size, add about $10 delivery for most small orders.
http://au.sportsdirect.com/lee-cooper-merino-wool-crew-neck-…
http://au.sportsdirect.com/lee-cooper-merino-wool-polo-top-m…
http://au.sportsdirect.com/lee-cooper-merino-wool-v-neck-jum…
I've found the quality of the Lee Cooper stuff to be more than adequate, especially given the price.
Closest I've found locally are $49 Target or DJ's 100% merino jumpers.
If you have an appropriate CC, change to NZ site for slightly cheaper prices.
Any limits to waiver shipping fees? Seems they're out of medium too which i think most people wear.