I am scrupulous and it’s hard to tell when I see two different sides being showed to me (no offense), but I looked it up and found a website that helps with scrupulous people. It says shopping should not be done, but it isn’t forbidden-here’s a copy of it
mission.liguori.org/newsletters/pdf_archive/april2005sa_web.pdf
Q. Is shopping on Sunday wrong? If so, is it also wrong to attend flea markets and antique
markets on Sunday if you buy a few things when doing this?
A. A scrupulous person often sees things as black or white, and this question is a
good example of how scrupulosity can creep into other areas of our life. A behavior is either
right or wrong. But a behavior can be acceptable in one circumstance and completely wrong in another.
For instance, an infant learning to walk can sneak up to the coffee table and snatch the cookie you
have in front of you, and we think that is cute. Wrong, of course, but we can accept it. When that same
baby is sixteen and does it, we no longer thing it is cute. We say then that it is not polite and wrong. This
is a small example of what it means to have “shades of gray” in a moral situation.
The question offers another gray area of moral behavior. On the one hand, we are to keep holy
the Sabbath and go to Mass on Sunday. So, if you are going to flea markets instead of Mass, that is
wrong. But what if you are doing both? Then we need to expand our thinking a bit.
We should not shop on Sunday if we can avoid it. Really, we should not shop on Sunday unless
we really need to do so. Perhaps we need to buy a prescription for someone who is sick. We can do
that. But, Sunday should not be a regular market day. Shopping, however, is not a forbidden activity.
The question is about buying things at flea markets. Since shopping is not really a forbidden
activity, you can buy things at flea markets and antique sales on Sunday. Sunday is the only day that
some of these function, so you may take advantage of that. Sunday is a day when we should rest and
refresh ourselves, and flea markets may do that for some people. They use it as recreation.
Your normal shopping should not be done on Sunday, as a general principle. For other circumstances,
such as the health of a person or simply for the recreation a flea market provides, such shopping
is not forbidden.