Usually marshalls has brand name golf polos for $30 or so

Check your local Marshalls/TJMaxx and Sam’s club has good prices on Greg Norman and Callaway shorts/shirts/pants.

Banana Republic performance taper pants at banana republic factory website is great got them for $40.

Saw a previous ask looking for good less expensive clothes. 

Found some great shorts at Costco - stretch and everything. Highly recommend. $20.

Sierra.com also has a ton of previous year gear - including adidas golf shorts. Also around $20/piece. 

https://www.costco.com/banana-republic-men's-flat-front-short.product.100788573.html

Discount Golf Clothes