I think B4 might be doing them now. Also, I think Dunk-n-Fluff offers custom slots weekly. You could message Tami, the owner. She's awesome to work with.
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when Bububebe opens customs you can send your fabric in. Just keep in mind they are in Canada. So it would take about a month in just shipping (round trip)
Re: Who does SYOF customs
DS1: 10/2005 DS2: 01/2007 DS3: 09/2010
Star Baby Designs and Piddle Poddles both do.
...Baby Blog...CD Blog...
DD1 born 5/24/10.
Missed M/C at 14 wks Feb 2012.
DD2 born 5/14/13.
Missed M/C at 9 wks July 2015.