When customizing your promotional gift items, be sure to take the time to ask for a pre-printing proof (and follow through by checking it closely, too) so that no "misprints" slip through the cracks.
Order a few extra promotional product items in case you may have mis-counted or forgotten to include a few infrequent customers or service providers that didn't make it onto your "need to shop for" list. Receiving a gift item without a personalized inscription or engraving will still be appreciated by the recipient and either way it is definitely better than not receiving a gift at all.
Consider getting all your gifts from just one or only a few select vendors. Offer and reap the benefits of being a repeat customer. By being exclusive to, or at least minimizing the number of, vendors that you patronize for your promotional product needs, you will reduce your overall costs. Promotional product items purchased from a company that specializes in just that, will get you lower per unit costs than to purchase each item individually in a retail outlet. Even with order minimums and some printing set-up costs, you still get a great value for your investment.