Title says it all.
How are weapon slots obtained?
Or you can buy them from other players, like me, who have bought them from the energy depot. You can also find them on the Auction House under "usable."
Are the weapon slots like the trinket slots...on a timer?
Search the Spiral Knights wiki for "weapon slot". Read the first page that comes up.
From the energy depot or you can buy it at Auction house, but it is going to be like 30k crs.
No, it's actually more like 17-18k
Onihito: Yes, they are timed. You have 30 days from when you use them before they go into a critical overload and need a replacement module. Sometimes, this destroys any weapon inside!
(They go into your Arsenal, use them and you have another slot, thanks to a bug sometimes any weapon in it is deleted when it wears off, unequip it on the last day)
Go to the Energy Depot. Two ways to get to it are:
A) On the left of the missions page, there is a clicky thing to get to it.
B) To the left of the Auction house, the Energy Depot Person stands.
Once at the energy Depot, I think you can just look at the featured items, and it'll be there.