Ordinarily the location of the vendor or distributor will not mean much because in these days of computer technology you can easily access the farthest part of the planet using email facilities.
It does not matter if the location of your vendor is halfway across the globe provided that such vendor renders good services and delivers quality promotional products.
Consequent upon the selection of vendor you will require checking and verifying some samples of the product that you are considering to buy. Normally the distributor will dispatch a free sample or the model of the main item free of cost so that you can verify, suggest any possible modifications and find out whether the same will suit your requirements.
At times when your vendor or distributor is located overseas you may have to incur a small expense in terms of shipping and delivery to get the samples. But the long term benefit that accrues from the verification of such sample will easily outweigh the disadvantages of incurring trifle expenses.
You are getting a chance to verify the item and its utility before placement of a larger order and this is most essential for success of any deal.
Depending on the size and type of order the distributor could even give you a sample of the promotional items with your logo before the full production starts. This will allow you to go ahead even before taking up the full production of the promotional item.