Don't scare the guy. The Oslofjord has plenty of good diving. There are 5 diveshops within an hours drive of the city. FUE.no (in Oslo, very close to the subway) will let you try and test the drysuits the sell providing they have it in stock (They have most sizes) and you don't need a custom fit.
Diving equipment in Norway isn't that much more expensive than abroad, and with the low Norwegian Krone you will get plenty bang for your buck. Also worth mentioning is the unique Norwegian consumer laws that give the buyer protection agains faulty goods for 2yrs for tings that are meant to last 2yrs or less, and 5 yrs for things that are supposed to last longer. (Although, normal wear and tear is not covered...)
Diving around the Oslofjord can be done from shore, or via the shops or the local dive clubs that have boats.
Fue has an excellent reputation. Their owners and employees are all active divers and the shop caters to all types of divers. (Technical, Recreational, CCR. TriMix, Argon. They have banked 32% at 300bars)
Fillcard for a full year of 32% will cost you 1395nok and you can fill as many bottles you want at a time
Fue is a GUE - affiliated store with the owner being our very own GUE T2 instructor Gunnar Midtgaard.
Other instructors that can help you are Annika Persson, Christian Vilming or Bjørn Opperud.
Dykkerutstyr
ProDykk is another excellent shop. They are situated at Fagerstrand in Nesodden. They have a very good environment to get to know other divers. This is a PADI affiliate and a drysuit class will cost you around 2K nok. This is one of the places that have their own pier and they always have coffee ready. (Sometimes even cake and waffles) This is a place where you can experience 3 wrecks on a short dive... 5 on a longer.... and 7 with a scooter. 8 with trimix
(In one dive...)
Prodykk Oslo
Gylte Divestore
Located in Drøbak. Has a very nice location for "flower dives". Slightly prone to bad viz after heavy rainfall, but has an abundance of critters. 41 nudibranchs has been identified just off the entry point
Shop also provide gas, toilets and waffles. They teach PADI and CMAS
Divestore Gylte Dykkersenter AS i Drøbak Dykk Mer Betal Mindre!
Oslofjorden Dykkesenter
Reasonably new divestore at Fornebu, but owner is a previous manager of a shut down divestore. They run classes from OW to ISE and IANTD Technical and Cave classes. (This is the only shop that run cave-classes) They also have a small satellite dive centre at Båtstø in Hurum where they often run their classes. They also have dive trips from their boat.
- Dykking i Oslo
If you are a student, Oslo University has a dive club OSI BAUS with a lot of active people. They also have instructors from CMAS. They have some gear to lend out.
Other clubs worth mentioning: De Glade Froskers Dykkeklubb, Drøbak undervannsklubb, Sandefjord Dykkeklubb, Tønsberg Dykkeklubb.
There are a lot of people diving in and around Oslo. From OW to CCR.
We have wrecks from 6-90m
Welcome to Oslo
(Oh.. and we have no dive season... we dive year round)