colgate mattress?

[lolasmom74]

Once Upon a Child (store in Austin) had a great sale and was offering the crib, changing table, changing pad and a colgate foam mattress for $535!
i just ordered it (da vinci parker in cherry!!)

now i'm concerned if i got the right mattress? it's a 4 inch foam. colgate makes them exclusively for this store.

anyone have any input?
thanks!