I told him (we're both PC players btw) that he should just do what I do (the intelligent thing) and just open up the construction set, place 500 Varla stones (weightless, naturally) and put them in his Anvil Home (or any other home he wants a safe storage space).
For some reason, he doesn't want to do this but at the same time, he is clearly jealous as I was showing him all my great mods, i.e. my endless supply of Varla stones, my health spells that give me 500+ health without using any magicka and my shield effects on my Hood of Invincibility which make me pretty much impossibe to beat in-game.
I'm sharing this wisdom btw as he (plus another friend of mine) just don't understand that you can make Oblivion work for you, not visa versa.
Spawning Varla stones is better than soul trap/collecting soul gems. Agreed?