Pretty much all 'mountain bikes' will have suspension in that price range. It is entry level and the manufacturers think they need to make them look like the expensive models to sell to newbies. Pretty much all bikes in a price range will be very similar, and at the end of the day who cares if the suspension is really only there for looks unless you are riding technical trails.
Pick a price point, then find one from a local bike shop you find helpful. Don't forget that your riders will need buy in - let them pick a colour/style they like. If they don't like it it will be a waste of money.
Alternatively you might find an online seller a bit cheaper, polygon, Cell, Reid but you wont get the after sales service you will at a good bike shop.