If they have other Speedball products (most art stores at LEAST carry the fabric inks), talk to someone and see if you can special order a handful of acrylic inks in.
I've done that through Wallack's in Ottawa (they only carry the fabric line). Had to wait for their next Speedball shipment, so it took a few weeks, but it meant I could choose exactly what I wanted. Only thing was, at least in my case, for the smallest size of ink, they needed an order of multiples of 6 (any colours), because of how they ship in a box. They might tell you the same. But those small jars are pretty cheap anyway, doesn't hurt to have different colours on hand.