The inspiration for this question is a bit odd, but I noticed that Tod's Workshop (a maker of high-quality historical weapon reproductions) has a few "mauls" listed, which are weighted with lead cores in the heads. The description for one reads:
"Medieval studded maul constructed from ash with multiple inset nails/studs and filled with lead. Exactly the sort of maul a poor archer may take.
This is the sort of medieval mace or maul that could be made in any village."
To get to the question, would lead have actually been an inexpensive material available to most medieval European villages, such that using it as a weight in a simple cudgel would be practical?
In 14th and 15th century England and Wales, lead would sell for about 1/3 to 1/2 d per pound (so under 1d/kg). A craftsmen at the time could earn about 4d per day (master craftsmen perhaps 6d, unskilled labourers perhaps 2d).
Some things that cost about the same as 1kg of lead:
1 litre of cheap wine
500ml of good wine
1 or 2 chickens
1kg of honey
1kg of cheese
The lead price above is at the mine, without any added transport costs.
As for the price of a lead-filled maul for an archer, the cost of an archer's other essential equipment would include:
Longbow: 12d
Arrows: 5 for 1d
and the archer would be paid about 4-6d per day (depending on when). Since the replica maul you link is about 500g, it has less than 1/2 d of lead in it. Even with a higher price of lead due to transport costs, it would be easily affordable by an archer.
References:
For prices of bows and arrows: u/Hergrim and u/terminus-trantor in https://www.reddit.com/r/AskHistorians/comments/7qzfyk/how_did_a_english_longbow_cost/
On the English lead industry: Homer, Ronald F., "Tin, Lead and Pewter," chapter 4 in Blair, John and Nigel Ramsay (eds), English Medieval Industries: Craftsmen, Techniques, Products, London: Hambledon Press, 2001.