Many Custom T-shirts printing companies out there are competing for a consumer base by having higher quality outputs is their advantage. Make sure to choose the best services at the best price. If you need that help with your marketing, it would be a prudent decision to spend more on printing such materials.
For instance a search on the internet will let you obtain local shops who have not yet got that much jobs and tend to be happy to function for less money to enable T-shirts to get their stock portfolio developed. More often than not you should check out a community university for art work or graphics majors that will be happy to tackle any project.