Which prints should be made to sell at the Comicon and how many? Please help me choose.. I want to have 4-5 different images available and then have a 'catalog' of sorts for my other work available for ordering or having ready for the next day of the convention. So, please help me choose!

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I will be exhibiting with my friend Amanda at this year's Toronto Paradise ComiCon. Prints and 1" buttons will be available for purchase from me at that time.
The convention is running July 12-13th and the Holiday Inn on King Street
Toronto, ON, Minutes from the subway
While my 8.5x11 (approx.) prints sell normally for $15US directly from me, they will only be $10CAN at the convention, smaller ones will be $3-5. Buttons will be sold for $1. There will also be some original sketches/line work for sale ranging from $20-40.
I work really slow (and I get nervous drawing infront of people), so I won't really be able to do any commissions at the show itself, but you can always contact me after the con.

I hope to see you guys there! It should be a lot of fun.
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I take commissions:
$20-$40US for line art, depending on detail (add $10/extra character). Please note that I do not use ink in my line art. I use pencil. Please also note that shading is extra.
$50-$100US for a coloured image, depending on details and number of individuals in the image.
Prices will vary from piece to piece. Please look at my gallery to see what I do.
Signed prints, directly from me on legal 8.5x11 matte cardstock are $10 each. Please contact me for the cost of 11x17 prints.
Prints on museum quality acid free Arches Cold Press Inifinity digital paper are $20.
All prices are in US dollars. I accept PayPal only.
Shipping is no longer included. I found out how pricey that was...
For standard post, please add $6. For Airmail, $10 and Express $15. (for North America. International orders a priced per order)