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How is 4thelement ?Some of it is word of mouth or if you have actually been to the there shop in person while on holiday, others is just as simple as looking up dealers the manufacture list. It is assumed that if the manufacture is listing them as a dealer then they would a reputable shop.
Some of the shops I have used in the past that I have had no issues with and would recommend and call trustworthy are:
The World of Rebreather & Technical Diving Products | Narked at 90 (They ship DHL or regular UK snail mail)
O'Three Custom Drysuits (super good to work with shipping to the US via DHL, even put a nice note in your box, stickers, a hat, and candies)
Deepstop - Diveshop for scuba divers - Deepstop GmbH (They ship DHL, sometime have really good deals on MK25's or DST's & DS4's)
SF-1 ScubaFreaks (ship regular mail)
Shop for Scuba Diving, Tech Diving, Underwater Photo, Swimming, Freedive - Gidive Store (Ship via UPS)
Diveinn | Online Shop für Tauch- und Schnorchelausrüstung (Ship regular mail)
The ONLY Specialist Apeks Site in the UK. In stock for fast despatch. (keep an eye on this site sometime they have killer sales on Apeks regs)
The biggest diveshop in Europe (Ship regular mail or DHL)
Fourth Element - Equipment for Adventure - Technical Diving (actually just placed an order with them today and they only charged £11.50 for DHL international shipping for top and bottom undergarments)
Potápěčské centrum Divers Direct (They ship FedEx)
And lastly Martin from Tecme Rebreather, Parts, Service, unique solutions he will ship regular post for really cheep or send things DHL for really reasonable prices.