Thanks for bringing up the main question.
There is already a post on this: Cheap Alternative Tiles - #8 by Kevin_Boenisch. It might help to do your research before asking a question.
There are plenty others (although varying in similarity to VEX’s tiles):
- 24" x 24" x 3/8" Multi-Purpose EVA Foam Mats | We Sell Mats™
- Norsk 240147 Interlocking Multi-Purpose Foam Floor Mats, 16-Square Feet, Solid Multi-Color, 4-Pack - Walmart.com
- https://www.amazon.com/Forest-Floor-Thick-Printed-Interlocking/dp/B017C1ZVH6?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=ATVPDKIKX0DER (Don’t worry, this is still foam)
The list goes on. You can find some more at companies such as softtiles.com and wesellmats.com.