Best affordable Linear Power Stage

You're going to have a very hard time beating any of the Sengterbelle R-Core power supplies on Aliexpress at anything remotely close to the price and probably at 3-4X the money. I read somewhere online that there is a UK audio retailer simply marking them up and selling them for around 400 GBP. 

R-Core like the Allo Shanti so extremely quiet with digital gear and benefits from a good power cord and DC cable (which are also ridiculously cheap on Aliexpress). 

I own 3 of them, 2 5V and a 12V for my modem/router. That one may have been the least bang for the buck but the two 5 volts I have here on a Topping E30 MK II DAC and a Wiim Pro + as a streamer only have been a huge bang for the buck and both directly compared to a less expensive Talema torroid based 25W power supply. I was really surprised at how much it elevated the performance of the Wiim as streamer only. 

https://www.aliexpress.us/item/2255800739878853.html?spm=a2g0o.productlist.main.2.4602q0IXq0IXoR&algo_pvid=ebc6e5de-591d-47f3-a8dd-8b269e4edf79&algo_exp_id=ebc6e5de-591d-47f3-a8dd-8b269e4edf79-1&pdp_ext_f=%7B%22order%22%3A%2282%22%2C%22eval%22%3A%221%22%7D&pdp_npi=4%40dis%21USD%2198.00%2198.00%21%21%2198.00%2198.00%21%402103247917433884451453150ee8fa%2112000038789771359%21sea%21US%21701030016%21X&curPageLogUid=b0Ovwh0Uv5oK&utparam-url=scene%3Asearch%7Cquery_from%3A

Just for future reference, you could not use the 15V version as linked to by @tyray with both the Laiv DAC and uDDC. Yes with the DAC but no with the uDDC as it is a 5V device and needs the 5V LHY specific to the uDDC as per the Vinshine website. 

The 5V LHY can also be ordered for $100 U.S. from Aliexpress which would make it even better value ;)

The Sengterbelle is still the one to get IMO.  I have a Talema based LPS like the LHY here to compare (it was the first LPS I purchased) and that one has been relegated to a secondary system, although it is still a nice improvement over no LPS, a power brick, etc. 

The Sengterbelle can also be purchased in dual output for a few bucks more should one want to go that route. But you're going to want the 2nd device to not be very power hungry typically in that situation. I'd rather just have two singles and be overkill on the power supply at the price of these.  

Same power supply tyray. The only difference is the 2nd output connection on one is USB A versus the standard barrel connector. You can purchase power supplies with both outputs barrel connectors or both USB as well if you search. 

Different Ali sellers will have different prices (and often slightly different descriptions). You simply need to shop around on the site for the same product.