$4.50: 300D body

Even the 300D 6.3mp can make nice prints. As I mentioned, I made some very nice 12x18 inch prints back then. Some 300D photos could go much larger. See this thread from 2018 about huge prints made by older cameras from 15+ years ago:

National Geographic photo gallery big prints

https://www.dpreview.com/forums/post/61682138

Yesterday I was at a National Geographic photo gallery. It is very similar to the Peter Lik galleries with dim lighting, black walls, and big, beautiful, glossy, very well lit photos. Of course, they are trying to sell them so the presentation is very nice. The info for each photo was a short caption, location, year, name of photographer, and the size in meters (longest dimension) of the print. The smallest prints were 1 meter and the largest prints were 3 meters, but most were 1.5 and 2 meters. Most of the photos were taken 2004-2015, but I saw one that was in 1999 and another in 2002. A few of the photos were landscapes, but mostly animals in Africa and elsewhere. A few photos included people, but not many. I guess it is harder to sell people photos. Of course, they all looked wonderful and I think the prices are pretty high.

No mention of the camera gear used, but I suspect most of them were taken with DSLRs since the bulk of the photos were 2004-2015 of animals, often in Africa. National Geographic galleries believe they have enough megapixels to print 2 and 3 meter prints from DSLRs made even 14-15 years ago.

https://www.natgeofineart.com/

Most of the worry I see sometimes here about print size is asking about making something like 24x30 or 30x40 inch prints -- that is 0.762 meter or 1.016 meter prints. Just a very small number of the National Geographic prints were 1 meter. Almost all were 1.5 and 2 meters, but several were 3 meters. So, above where I say 'fairly large' that is not really correct. Most people asking and worrying about print sizes here are talking about the smallest or even smaller prints than what they have at the National Geographic photo gallery.

If you don't remember what were the common, high end Nikon and Canon DSLRs back in 2003, 2004, 2005 era that were probably used for many of the photos from 2004, 2005, and 2006 then look back and see. Nikon was selling only APS-C models, but Canon had FF, APS-H, and APS-C.

Later I received an email advertisement from the National Geographic Fine Art Galleries. In it there was a mention that their prints start at $4600. This 2010 one is $4900:

https://www.dpreview.com/forums/post/63169520

This 2007 one is $6750:

https://www.dpreview.com/forums/post/64219750