I think going a little deeper than the first page is warranted .. When your order is completed you have more than UPS as an option .. I get USPS service from Titan all the time ..
I also use Higginson Powder .. Fine folks .. Great service .. and #Canadian .. You can call higginson powder and it is in the mail that day .. They usually have a deep stock, but some items can be a bit more in price as they have to pay the full load .. Duty taxes to have it in stock.
If I am pro Canadian .. Why have I used Titan .. # Higgiinson like Titan are main supply lines for Lee .. Higginson has had large quantities of stock in the past although the to ran short on many molds in the last months .. It appeared to me a few months ago when I was buying molds ,that I was gauranteed #Titan had sold out due to the US rush, and they had been restocked with the new Lee mold style , while the last mold I got from Higginson ( 180 30cal ) was of the old style ..
I would hazard that Higginson has no older style two cavity molds in the most sought after calibres left , and have also been supplied with the new design. You can ask them when they take your order , as their operators can access stock ( touch it ) as they take your order , .. They are very good and worth the little bit extra they add .. Great secondary products also .. Brass , etc.