I only know what the custom ones I buy online normally cost. Generally about $5, including S+H. Maybe supplies go WAY up when you purchase small quantities. No idea. Hell, the shirts we did over at Zazzle are close to double what I was able to get done locally. Go figure.
I'm sure you wouldn't try and make a profit off the Siglerisimo's intellectual property. You're an OJ; you know how the whole making custom merchandise thing works.
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Tangent & Funky Name Brother; Founder of the Gutter Brethren; Frequent [flickr-photo:id=3274749401,size=m]
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Prøducer øf Døøm, Høst øf Tuesday Terrør, Funky Name Brutha, Retired Gutter Brethren & Tangential Tyke