The minis are no longer for sale on the LB website (for separate purchase) and they are sold out most everywhere (after being put on sale and then placed on the mamabargains circuit until stock was cleared out).
Lexie Barnes does plan on releasing new prints and new bags soon. As in, any day now.... So hopefully the minis will be available for separate purchase again, in new prints (fingers crossed). If you can deal with boring old black, Spire makes minis (they are called "Atoms" on the spireusea.com website). Spire is the company owned by Corey Barnes, who is Lexie Barnes' husband.
Not sure what is most like the small minis - maybe the 2 smaller Be Set bags from Ju Ju Be?