Was checking out this site a few days ago when I saw they just recently posted a 50% off suits coupon which works even on their heavily discounted stuff. Similar to Sports Direct, they have an Australian seeming website but they're actually UK based and ship from there AFAIK.
I also have no idea about what fabric constitutes "Lightweight Durable Fabric" but their reviews of their products the company in general seem decent enough.
See these links for reviews on trustpilot here and here and also on amazon. But really at $50 I figured it was worth a punt given their general feedback.
The linked suit has the most stock in various sizes but I've also included some other options below. Unfortunately there's pretty limited sizing left on these, nevertheless you can actually still buy the jacket or pants individually and get the blazers for $30 and pants for $15 or thereabouts. I've listed them generally in descending order of available sizes and not bothered to include ones with only one or two sizes left.
Dobell Pacific Blue Slim Fit Suit - $89.99 reduced to $49.99 + Shipping
Dobell Silver Grey Pindot Slim Fit Suit - $84.99 reduced to $42.49 + Shipping
Dobell Cream Linen Suit - $129.99 reduced to $64.99 + Shipping
Dobell Light Blue Linen Suit - $119.99 reduced to $59.99 + Shipping
Dobell Stone Grey Suit - $84.99 reduced to $42.49 + Shipping
This list isn't exhaustive and there are other suits that the code applies to, you can check out their website here
Christmas Suits are a sight to behold.