recommend vitamin/B1

please,
Can someone recommend a online supplier, or shop, of a good multivitamin and multimineral and B1 supplement for a diabetic (type II diet only), including what brand to buy.
thank you
Red
ps im collecting my exercise bike tomorow how fun is that

thanks hana, may I ask do I buy a mult vit and multi min AND a B1 supplement or does the frist two cover the B1