A search of Amazon.com for Tattersall shirts gives a listing of number of shirts that might work. Some have button down collars some do not:

Even Walmart.com has listing for Tattersall Shirts.

These might not be the best sources or true Tallersall shirts but they are places to start.

Heads up to anyone looking for an inexpensive (almost) tattersall shirt, check out Target. I found a blue checked shirt from there that has a button-down collar, but is fitted for those of us with “less substance.” Plus, I’ve always been impressed with Target’s quality for the price point.