I collect coins, in fact, numismatics is a hobby that dominates my interest for video games by far. However, I do not buy mint products directly from the United States mint. I prefer earlier US Federal coinage and have focused on a United States type set consisting of the half cent through double eagle and everything in between from the draped bust era forward. I also collect Indian Head cents and large cents. Finding a nice 1823 took some patience!
If you plan to collect quality coins, I would recommend only buying coins certifed by PCGS or NGC in problem-free holders. Problem coins are less marketable when you decide to sell. My strategy is to be patient and wait for local coin shows. I never buy from Ebay. I live in a fairly large town, so this is a feasible option for me. In fact, there are four coin shows every year with one LARGE coin show (The Money Show of the Southwest) held at the end of every year. I recomend not being a slave to the Greysheet or other price guide. Realize that quality coins are often not to be found for price-guide values. When it comes to video games, I'm cheap. However, when it comes to coins, I'm willing to pay for quality.
I have a large numismatic library including many hard-to-find coin books that cannot be found in typical book stores. I have been a member of the local coin club for over five years, and have even attended the American Numismatic Association Summer Seminar in Colorado Springs twice. I took a course in Indian Head cents taught by Richard Snow and a course on grading.
I've seen everything, from the unique 1849 double eagle, Quintouple Stella, 1804 silver dollar, 1787 Brasher Doubloon, 3 of the 5 known 1913 Liberty Head nickels, an uncut sheet of $100,000 bills, the Harry Bass collection of United States patterns and complete set of US gold, the unique 1870-S $3 gold, the 1794 silver plug dollar, and the list just goes on and on. I've seen all these in person, not just in photos.
My collection has a few highlights:
1787 Massachusetts large cent, PCGS VF25
1820 Large Cent, NGC MS62
1804 Half Cent, PCGS F12
1857 Large Cent, PCGS XF45
1861 Indian Cent, PCGS MS63
1864 Two Cent, PCGS MS64
1834 Half Dime, PCGS AU55
1866 nickel, PCGS AU58
1837 Dime, NGC MS61
1889 Dime, PCGS MS63
1899 Dime, PCGS MS64
1875-S Twenty Cent, PCGS AU50
1875-S Twenty Cent, NGC AU58
1875-CC Twenty Cent, PCGS G6
1806 Quarter, PCGS VG10
1844 Quarter, raw AU55
1901 Quarter, ANACS MS62
1917-D Standing Liberty quarter, NGC MS63 Full Head
1917-S Quarter, PCGS MS62
1928 Quarter, NGC AU58
1807 Draped Bust Half Dollar, NGC VF25
1808 half dollar, PCGS VF20
1838 half dollar, NGC AU55
1853 half dollar, PCGS XF40
1901 half dollar, NGC MS62
1798 Draped Bust Dollar, NGC VG10
1847 Seated Liberty Dollar, NGC XF45
1871 Seated Liberty Dollar, PCGS XF45
1861 gold dollar, NGC MS61
1857 quarter eagle, NGC AU55
1911 quarter eagle, NGC Au55
1885 half eagle, PCGS MS61
1915-S half eagle, ANACS AU50
1872 $3 gold, PCGS AU55
1894 eagle, PCGS MS61
1908-S eagle, PCGS AU58
1894 double eagle, NGC MS62
1928 double eagle, PCGS MS63
I have so many others that the list could go on for pages. I also have some old currency.
Everything is safety stored in the bank's safety deposit box. It's an interesting hobby and full of history!