Where can I find a reference for someone becoming a sotapanna through meditation? I've come across many stories in the Tipitaka where people attained arahanthood or became non-returners through meditation. However, I cannot recollect any instance where someone becomes a sotapanna through a meditation practice (including vipassana). 

Can someone provide me a reference for such an instance (or multiple instances) from suttas, commentaries or any other source in the Pali canon (ideally excluding Visuddhimagga)?

The reason why I'm asking this is that there's a claim by certain lineages that stream entry cannot be reached through meditation, at least based on Tipitaka evidence.
I've come across many stories in the Tipitaka where people attained arahanthood or became non-returners through meditation.


The different doors through with you can get liberation are given in Vimutt’āyatana Sutta, which are:


listens to the Dharma
teaches the Dharma in detail
recites the Dharma
applies his mind to the Dharma
properly grasps some concentration-sign


Which in turn leads to:


gladness arises in him;
because of gladness, zest arises;
because of zest, the body becomes tranquil;
when the body is tranquil, he feels happy;
a happy mind becomes concentrated
unfreed mind of a monk, dwelling heedful and exertive, finds freedom; or where the mental influxes, not wholly destroyed become wholly destroyed, where the unattained unsurpassed safety from the yoke is attained.


Meditation is only one of them.


  
    Mahanama, Sarakani the Sakya kept the training (in moral virtue, concentration, and
    wisdom) at the time of his death.
  


Sarakani Sutta 1

Sarakani became a stream winner because keeping up the training though he was a drunken also. This might happen all at once where one becomes liberated or may achieve it in stages, entering through any of the doors above, where sotapanna is 1st of the stages:


  
    Bhikshus, I do not say that final knowledge is achieved all at once. On the contrary, final knowledge
    is achieved by gradual training, by gradual practice, by gradual progress.
  


Kīta,giri Sutta