Try finding the manufacturer of the yarn - their site will often list shops that carry it.
Also try www.yarndex.com
. You can find other yarns with the same guage that may be easier for you to find.
My last thought - if you're making baby blocks, size really isn't a major factor. What will it matter if the pattern makes a 2" block. You can use different yarn and make a 2.5" block. Or whatever, so long as it isn't too small.