Yes. Budget sling straps do exist, and DIY is also an option.

From the community replies, common low-cost choices include generic “camera sling” straps sold on eBay and lower-priced “Quick Strap” style products, often around your target budget. They may not be as refined as premium brands like BlackRapid or SunSniper, but users reported they can work well.

If you go with a cheaper strap, pay close attention to the attachment hardware—especially the carabiner, swivel, and tripod-socket connector—since that’s the most likely weak point. If the included hardware looks questionable, replacing it with better parts is a good idea.

A DIY sling is another practical route: you can buy webbing, buckles, and hardware separately and build a custom strap for less than a branded system.

So the short answer is: yes, there are cheaper alternatives, but prioritize secure hardware and build quality over the absolute lowest price.