Question: Some years ago, particularly before the 1990s, there way a saying in Europe that (paraphrased) you can sell your blue jeans in every part of Eastern Europe and literally live like a king for a week.

Naturally things have changed since then. But is it still possible to do so in any part of Europe?

Answer: 
Let's take this one step at a time.

1. First you must own jeans. Here's your problem - you'll want them to be worth a bit. You can buy jeans for anything from $5 to a few hundred dollars if you really want to in western clothing stores. Let's say an expensive pair - US$200, and I assure you I've never spent that much on a pair of jeans.
2. Now let's assume you could even sell them for the original purchase price - anywhere. ([Take a look at "Global Poverty and the Cost of a Pair of Jeans](http://www.npr.org/blogs/money/2010/03/how_much_does_a_pair_of_jeans.html)). So you've sold your jeans and have the local equivalent of US$200 in cash.
3. Your first problem is the Euro. Even what used to be cheapish countries (Estonia) have seen increases in prices since the arrival of the Euro.
4. Secondly is finding accommodation 'fit for a king'. I'm not terribly experienced in this, tending to use hostels, but let's say we take my best bargain, which was in Rzeszow, Poland, where for the equivalent of £20 ($30) we had the 2 bedroom suite on the top floor of a hotel for a night, on the main square of the town. To this day I have no idea how this happened, and it included breakfast.
5. So now you've got accommodation, although at $30 \* 7, you've just barely got your accommodation if they give you a slight discount for a weekly rate. But hey, that's pretty good. And you've got breakfast, even if it was toast and fruit :)

So in a way, you can still do pretty well sometimes - not spending much doesn't mean you have to stay in hostels all the time. And with travel deals available on [travelzoo](https://www.travelzoo.com/) or other sites, you can sometimes land a stunning resort spot on the beach for a week in Turkey for a similar price. It just requires looking around, and of course, a lot of luck.
Yes, real Levi's still go for considerably more in foreign countries than in the US, in official shops. Like 501s are usually under $50 in the US, and over $100 in Australia. This is partly historic, partly due to currency fluctuations and the dollar being down at the moment, and partly due to VAT/GST.

No, you will not easily find someone to buy your one pair of jeans in a random size at those same prices. Wouldn't you just buy them from US eBay if you were them?