Wasn't sure where to post this (as I am not selling nor benefiting from this in any way). Just saw sharpies (12 count for $4.79) with coupon code 10174 at checkout. Seems like a good deal and a lot of magicians use these:

https://www.staples.com/sharpie-permanen......&encode=

Please feel free to move to anoter section if this one is not correct...