You asked where you can get an Experian score - I assume you mean an Experian FICO score. llecs answered that question in the third sentence of his reply to you:
"Finally, as of last year, Experian no longer allows consumers to pull their own EX FICO score, but you can get it from your lender or on your checking statement if you happen to have a checking account with a CU in PA called PSECU."
With regard to your line of reasoning regarding the averaging of your EQ and TU FICO scores with a non-FICO Experian score to generate a putative estimate of your actual Experian FICO score, I doubt that this would yield an accurate result, unless it happens to be a remarkable coincidence. First, the data contained at the credit bureaus often differs, so the scores can vary (sometimes greatly, depending on whether there is a significant derogatory entry on one credit report and not on another). Second, the FICO scoring formulas among TU, EQ, and EX are all slightly different, so the same set of data can yield subtly different results. Third, the non-FICO scoring models, though they use similar criteria in generating their respective scores, do in fact use formulas that are different from their FICO counterparts. Fourth, because some non-FICO scores (e.g. the Vantage Score) use an entirely different scale (up to 990), the score that you get cannot be easily converted to a FICO score. Some people have tried to do this, but have come up with varying results. Fifth, certain types of credit may be treated differently among FICO and non-FICO scores. For example, high-CL HELOCs are scored as installment in the FICO scoring model, whereas some non-FICO models score them as revolving. Another example is this: when a credit card with a balance is closed by a creditor and the credit limit is reported as zero, the balance of the CC is not used to calculate utilization in the FICO score. However, this is not the case for some non-FICO scores, and consumers will see a utilization in excess of 100% that is severely detrimental to their non-FICO score, without a corresponding drop in their actual FICO score. There are probably other reasons why this notion of yours may not be valid.
The bottom line is this: one cannot easily get an accurate sense of their Experian FICO score without obtaining it through one of the methods described by llecs. I suppose you're free to experiment with your own personal scores in a manner as you have suggested; if you do, I'm sure there are people here who would be interested in your results, so please report back with your findings. You'd have to burn a hard inquiry or two with a lender in order to find out whether your calculation correlates with your actual Experian FICO score, so you'll have to determine whether or not this is something you really want to do.
