Cheapest & most effective option for covering 100 sq feet of basement floor?

I'm wanting to turn the corner of my unfinished basement into a combination of a hangout and a workout apace. The floor I want to cover is about 10'x10'. I've been looking at those foam puzzle mats but it still seems to be around $120 to cover that whole area, just going with the cheapest possible mats.

Is there any other cheaper option? Really all I'm looking for is something to soften the concrete floor enough for exercise/yoga, and something I can run a swiffer over regularly, after a workout (i.e. not carpet). Any and all suggestions welcome. TIA!