Availability (1,R, 3,X, etc.)

[Mojomoe]

Quick question -

Are there official rules/good house rules/common sense for when and how to implement Availability into actually finding an item? I realize we've never used this in our games and I'm looking to use it.

For example, my group drops by some mid-rim dustball with a medium-sized market (we'll call it a Stellar-class starport), pops into the local Guns R Us, and looks to buy a specific blaster they've been wanting, say something in the 3, F range.

Is there a ruleset I can apply to say, "using this mechanic, you've found the gun / this seller does not have this item"...?

I mean, something as simple as rolling 1D, and as long as the result is greater than the Availability of the item sought, there is one available (with F, R, or X adding 1 to the difficulty). For example, rolling for the 3, F blaster, I'd have to roll a 5 or 6 to find it (Roll > 3+1[because of F]). If I wanted to find a lightsaber, I'd have to roll a 6 (Roll > 4+1[because of X]).

Any help?
Maybe something that takes the type or class of planet into account? Am I missing something obvious here?

[garhkal]

When using "Business or streetwise to find an item", i go by

1 items are V/Easy to locate (5)
2 items are Easy to locate (10)
3 are moderate (15)
4 are difficult (20).

Add 5 for an item that is F
10 for items that are R
and 15 for items that are X.

So if i was hunting down a 3R blaster, i would need to roll a 25 business or streetwise to locate a place that sells it.
Once located, then it comes to Bargaining to see if you pay more than list cost.
_________________
Confucious sayeth, don't wash cat while drunk!

[Mojomoe]

That's great - are those official rules, or house made?

So it sounds like I'm doing it backwards - finding the shop then rolling to find the item, rather than rolling to find the item then locating a shop?

[CRMcNeill]

[garhkal]