Terri,
I regularly buy stuff and can reccomend the following shops:
Regular and well known shops within our WW1 community, you probably knwo about them but anyway:
Nordlandmodels - a bit expensive shipping, but can buy many things from just one place instead of few shops
Jadarmodel - there are some things (like PART photoetch) that you can buy just from them and noone else, but I prefer to go there personally once or twice a year and get everything I'm going to need.
Gaspatch models - I buy their products directly from them, never had any issues
Aviattic - pure awesomeness
Other shops:
hobbyeasy - I strongly reccomend this Hong Kong based shop with probably the lowest prices I have ever seen. They have a lot of stuff for scratchbuilding and the "regular" modelling topics especially cars, not that much WW1. I have used them 4-5 times already, the shipping is normal to cheap, the item prices ar elike 50% of the prices at the UK shops and never had issues with them so far.
Hobbylink Japan - a japanese shop full with some items that can't be found that easily on the EU market, expensive shipping. never had issues with them.
Hobbycult - my local shop (ships worldwide thou), they regularly make preorders on all kind of brands and the prices are absolute blast. Never had issues with them and I can strongly reccomend them.
Hiroboy - a UK based shop specialized on car and bike kits. Very expensive with very expensive shipping, but if you are going to build a car model and want to buy all the possible aftermarket and scratcbuild additions to it, together with a color matched paint specific for the car you are buidling, then this is your place.
I hope this helps
best regards,
Sasho