About 25 years ago, I had a youthful intrest in blacksmithing, inspired by a very informative week and a half visit with Daniel Boone, a direct decendant of the one we read about in history books, and also a full-time blacksmith. Great guy, very talented, makes beautiful wrought iron decorative and useful items. Taught me a boat-load about metal working, and its manipulation both hot and cold, knowledge I use often to this day, frequently thinking as I work "Thank you Daniel Boone!"
As to anvils, I have one, about #175, with a nice 'ring' to it... it was pretty beat up when dad and I found it, cant remember what we paid for it, but not sure its even relevant now, but $1/pound has always stuck in my mind as a fair price for one in fair shape. Check local trade papers, classifieds, Craigslist, facebook marketplace, anything is possible...
As mentioned, an old chunk of railroad track works good for a farm beater "ASO", my dad had two for years. One 'right side up', with one end cut to a point, one end square, the other track turned upside down, so it was nice and flat on top, about 6-7" wide and about 18" long, also cut to a point on one end. Had flat plate feet welded on what was now the bottom so it could be lag bolted to a big chunk of sycamore stump as a base. Worked for farm use just fine.