I'm a vryloka cosmic sorcerer. I choose to start with a 16+2 Charisma to get some extra Dex from the point buy and my first three feats were almost entirely focused on boosting defenses and damage (Unarmored Agility, Improved Defenses, Dual Implement Caster), which means my attack bonus is pretty low (+7 at level 5, including Inherent Bonuses).
I already plan getting the Implement focus and the Accuracy competence feat (changing my staff of ruin with an accuracy one might be a good idea then), but I was looking for something I could do now, by buying items.
I own a staff of ruin, an artifact staff and the vicious dagger I had before finding the artifact and an amulet of protection.
I also own an amulet of protection that magically turned into a 360gp check when the DM decided to use Inherent Bonuses for our new campaign.
As a party of five, we have almost 2000 gp to spend and it's possible we get an NPC to find us a single uncommon item by winning a skill challenge.
Inherent bonuses also mean that investing in a +2 weapon is not a very good idea, except maybe for my staff of ruin (but I'm not sure the extra damage is worth the price difference).
I can get items from almost any manual, but not from Magazines and settings outher than the Forgotten Realms.