The problem for me with "newer" Naxos CDs is they hardly ever go cheap in the second hand market. Early Naxos discs are often dirty cheap used, but the Naxos discs released after 2005 or so rarely go under say £3 used. For me the whole point of Naxos has been low price and Naxos has developped into a "mid-price" label rather than a budget label. That's why I go to full price labels instead to get superb stuff, but I also have to buy much less to keep the expensies reasonable.
For example the best deal for Symphony 6 I can see is £6.08+ £1.79 Delivery = £7.87 = 8,75 €! That's for a USED CD! In the past I walked into a store called "Anttila" in Helsinki and they had "buy 4, pay 3" Naxos campaign so I got 4 CDs for 3*8 € = 24 € = 6 € (£5.5) per disc for NEW CDs in plastic wrappings! So, I can get old Naxos cheap, but Naxos DIDN'T release Weinberg in the past! All of it is relatively new and "expensive." Other Weinberg releases are some old stuff on obcure labels, much of it OOP and the prices reflect that! CPO doesn't do symphonies because they coordinate with Naxos. So, exploring Weinberg's symphonies has been a pain in the ass! So frustrating! If Weinberg was as "famous" as Shostakovich (and he should be imo!) there would be many boxes of all symphonies at affordable prices (all symphonies for 79 euros for example).
So, instead of Weinberg's symphonies I might buy a MIRARE label release of German baroque because they do it JUST RIGHT for my taste and it is heavenly! Pricy, but heavenly!